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		var a = 100;					//类型都是number
		var b = 234234234324324324;  	//类型都是number
		var c = 3.234234234324324; 		//类型都是number
		var d = -23423432432432432;  	//类型都是number
		var e = -34.3423423432;    		//类型都是number
		var f = 0.324234234;    		//类型都是number

		console.log(typeof a);  // number
		console.log(typeof b);  // number
		console.log(typeof c);  // number
		console.log(typeof d);  // number
		console.log(typeof e);  // number
		console.log(typeof f);  // number
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